Question
Download Solution PDFA push-pull amplifier is used for:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFPush-Pull Amplifier
Push-Pull Amplifier is a power amplifier which is used to supply high power to the load.
It consists of two transistors in which one is NPN and another is PNP. One transistor pushes the output on positive half cycle and other pulls on negative half cycle, this is why it is known as Push-Pull Amplifier.
The advantage of Push-Pull amplifier is that there is no power dissipated in output transistor when signal is not present.
There are three classification of Push-Pull Amplifier but generally Class B Amplifier is considered as Push Pull Amplifier.
1.) Class A amplifier
- Class A configuration is the most common power amplifier configuration.
- It consists of only one switching transistor which is set to remain ON always.
- It produces minimum distortion and maximum amplitude of output signal.
- The efficiency of Class A amplifier is very low near to 30%.
- The stages of the Class A amplifier allows same amount of load current to flow through it even when there is not input signal connected, therefore large heat sinks are needed for the output transistors.
2.) Class B amplifier
- Class B amplifier is the actual Push-Pull Amplifier.
- The efficiency of Class B amplifier is higher than Class A amplifier, as it consists of two transistors NPN and PNP.
- The Class B amplifier circuit is biased in such a way that each transistor will work on one half cycle of the input waveform. Therefore, the conduction angle of this type of amplifier circuit is 180°.
3.) Class AB amplifier
- The Class AB amplifier circuit is the combination of both Class A and Class B amplifier.
- A common method to remove that crossover distortion in Class B amplifier is to bias both the transistor at a point slightly above then the cut-off point of transistor. Then this circuit is known as Class AB amplifier circuit.
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